<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="#">全部</a>
                </li>
                <li
                  v-for="subjectNested in subjectNestedList"
                  :key="subjectNested.id"
                >
                  <a
                    :title="subjectNested.title"
                    @click="seacherOne(subjectNested.id, index)"
                    href="#"
                    >{{ subjectNested.title }}</a
                  >
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="subject in subSubjectList" :key="subject.id">
                  <a
                    :title="subject.title"
                    @click="searchTwo(subject.id, index)"
                    href="#"
                    >{{ subject.title }}</a
                  >
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{ 'current bg-orange': buyCountSort != '' }">
                <a
                  title="销量"
                  href="javascript:void(0);"
                  @click="searchBuyCount()"
                  >销量
                  <span :class="{ hide: buyCountSort == '' }">↓</span>
                </a>
              </li>
              <li :class="{ 'current bg-orange': gmtCreateSort != '' }">
                <a
                  title="最新"
                  href="javascript:void(0);"
                  @click="searchGmtCreate()"
                  >最新
                  <span :class="{ hide: gmtCreateSort == '' }">↓</span>
                </a>
              </li>
              <li :class="{ 'current bg-orange': priceSort != '' }">
                <a
                  title="价格"
                  href="javascript:void(0);"
                  @click="searchPrice()"
                  >价格&nbsp;
                  <span :class="{ hide: priceSort == '' }">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total == 0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam"
              >没有相关数据，小编正在努力整理 中...</span
            >
          </section>
          <!-- /无数据提示 结束-->
          <article class="comm-course-list" v-if="data.total > 0">
            <ul class="of" id="bna">
              <li v-for="item in data.list" :key="item.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img
                      :src="item.cover"
                      class="img-responsive"
                      :alt="item.title"
                    />
                    <div class="cc-mask">
                      <a
                        :href="/course/+item.id"
                        title="开始学习"
                        class="comm-btn c- btn-1"
                        >开始学习</a
                      >
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a
                      :href="/course/+item.id"
                      :title="item.title"
                      class="course-title fsize18 c-333"
                      >{{ item.title }}</a
                    >
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span
                      class="fr jgTag bg-green"
                      v-if="Number(item.price) === 0"
                    >
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">9634人学习</i>
                      |
                      <i class="c-999 f-fA">9634评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a
              :class="{ undisable: !data.hasPrevious }"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)"
              >首</a
            >
            <a
              :class="{ undisable: !data.hasPrevious }"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current - 1)"
              >&lt;</a
            >
            <a
              v-for="page in data.pages"
              :key="page"
              :class="{
                current: data.current == page,
                undisable: data.current == page,
              }"
              :title="'第' + page + '页'"
              href="#"
              @click.prevent="gotoPage(page)"
              >{{ page }}</a
            >
            <a
              :class="{ undisable: !data.hasNext }"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current + 1)"
              >&gt;</a
            >
            <a
              :class="{ undisable: !data.hasNext }"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)"
              >末</a
            >
            <div class="clear" />
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import courseApi from "@/api/course";
export default {
  data() {
    return {
      page: 1, //当前页
      data: {}, //课程列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex: -1,
      twoIndex: -1,
      buyCountSort: "",
      gmtCreateSort: "",
      priceSort: "",
    };
  },
  methods: {
    //根据价格进行排序
    searchPrice(){
      //设置对应变量值，为了样式生效
      this.buyCountSort=''
      this.gmtCreateSort=''
      this.priceSort='1'

      //把值赋值到searchObj中
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.priceSort = this.priceSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort

      //调用方法查询
      this.gotoPage(1)
    },
    //根据最新进行排序
    searchGmtCreate(){
      //设置对应变量值，为了样式生效
      this.buyCountSort=''
      this.gmtCreateSort='1'
      this.priceSort=''

      //把值赋值到searchObj中
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.priceSort = this.priceSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort

      //调用方法查询
      this.gotoPage(1)
    },
    //根据销量排序
    searchBuyCount(){
      //设置对应变量值，为了样式生效
      this.buyCountSort='1'
      this.gmtCreateSort=''
      this.priceSort=''

      //把值赋值到searchObj中
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.priceSort = this.priceSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort

      //调用方法查询
      this.gotoPage(1)

    },
    //课程第一次查询
    initCourseFirst() {
      courseApi.getConditionPage(1, 8, this.searchObj).then((resp) => {
        this.data = resp.data.data;
      });
    },
    //查询所有一级分类
    initSubject() {
      courseApi.getAllSubject().then((resp) => {
        this.subjectNestedList = resp.data.data.list;
        // this.subSubjectList = resp.data.data.list.children
      });
    },
    //分页切换方法
    gotoPage(page) {
      courseApi.getConditionPage(page, 8, this.searchObj).then((resp) => {
        this.data = resp.data.data;
      });
    },
    //点击某个一级分类，查询对应的二级分类
    seacherOne(subjectParentId, index) {
      //把传递来的index赋值给ondex，为了active样式生效
      // this.oneIndex = index
      // this.twoIndex = -1
      // this.searchObj.subjectId=''
      // this.subSubjectList=[]

      //把一级分类点击的id值，赋值给searchObj
      this.searchObj.subjectParentId = subjectParentId;
      //点击某个一级分类进行条件查询
      this.gotoPage(1);

      //拿着点击的一级分类id 和 所有一级分类id进行比较
      //如果id相同，从那个一级分类中获取他的二级分类
      for (let i = 0; i < this.subjectNestedList.length; i++) {
        //获取每个一级分类
        var oneSubject = this.subjectNestedList[i];
        //比较id是否相同
        if (oneSubject.id == subjectParentId) {
          this.subSubjectList = oneSubject.children;
        }
      }
    },
    //点击某个二级分类实现查询
    searchTwo(subjectId, index) {
      //把index赋值，为了样式生效
      this.twoIndex = index;
      //把二级分类点击id值，赋给searchObj
      this.searchObj.subjectId = subjectId;
      //点击某个二级分类进行调节查询
      this.gotoPage(1);
    },
  },
  created() {
    //课程第一次查询
    this.initCourseFirst();
    //一级分类显示
    this.initSubject();
  },
};
</script>
<style scoped>
.active {
  background: #bdbdbd;
}
.hide {
  display: none;
}
.show {
  display: block;
}
</style>